MsDpo4-a DinB Homolog from Mycobacterium smegmatis-Is an Error-Prone DNA Polymerase That Can Promote G:T and T:G Mismatches.

ABSTRACT: Error-prone DNA synthesis in prokaryotes imparts plasticity to the genome to allow for evolution in unfavorable environmental conditions, and this phenomenon is termed adaptive mutagenesis. At a molecular level, adaptive mutagenesis is mediated by upregulating the expression of specialized error-prone DNA polymerases that generally belong to the Y-family, such as the polypeptide product of the dinB gene in case of E. coli. However, unlike E. coli, it has been seen that expression of the homologs of dinB in Mycobacterium tuberculosis are not upregulated under conditions of stress. These studies suggest that DinB homologs in Mycobacteria might not be able to promote mismatches and participate in adaptive mutagenesis. We show that a representative homolog from Mycobacterium smegmatis (MsDpo4)

SUBMITTER: Sharma A 

PROVIDER: S-EPMC3317225 | biostudies-literature | 2012

REPOSITORIES: biostudies-literature